This device has recently appeared in canned beers in an attempt to
mimic the taste and appearance of a true draught beer. It employs a
small plastic bladder filled with a mix of nitrogen and beer at the
bottom of the can. When the can is opened, the mixture is forced out
through small holes in the bladder causing considerable turbulence at
the bottom of the can. This results in a thick, foaming head of
creamy bubbles. While not real ale (see next), this process does
mimic the serving of beer through "swan necks" or "sparklers" and is
the subject of much debate.

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